MAX3040CWE+T

Overview

The MAX3040CWE+T is a quad RS-485/RS-422 transmitter manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply with a typical operating current of 1mA and a shutdown current of 2nA. The device supports data rates up to 250kbps and features ±10kV ESD protection (Human Body Model) and ±4kV Electrical Fast Transient immunity per IEC 1000-4-4. It utilizes a 16-pin Wide SO package and functions within an industrial temperature range of 0°C to +70°C.

Feature Summary

• Hot-swap capability prevents false transitions during power-up or hot insertion
• Slew-rate limiting minimizes electromagnetic interference and cable reflections
• Guaranteed device-to-device skew for precise timing control
• Pin-compatible with industry-standard 'SN75174, 'DS26LS31C, and LTC487

Applications

• Telecommunications equipment
• Industrial motor control systems
• Transmitters for ESD-sensitive applications
• Hand-held equipment
• Industrial PLCs and networking

Procurement Notes

Verify the specific suffix '+T' against official documentation to confirm tape-and-reel packaging requirements. Ensure the component meets RoHS compliance standards as indicated in the datasheet. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity before procurement.

Selection Notes

Select this component when designing RS-485 or RS-422 networks requiring low-speed transmission up to 250kbps. It is suitable for environments needing robust ESD protection and hot-swap functionality. Consider the 16-pin Wide SO package constraints and verify compatibility with existing receiver ICs like the MAX3093E or MAX3095 for optimal system performance.

Part Context

This component belongs to the MAX3040–MAX3045 family of 5V quad transmitters designed for twisted-pair balanced lines. It serves as a low-power upgrade to legacy interface standards, offering enhanced noise immunity and reduced reflections compared to older discrete solutions while maintaining pin compatibility.

Replacement Considerations

Public confirmed substitutes include MAX3040CSE+, MAX3040CUE+, MAX3040EWE+, MAX3040ESE+, and MAX3040EUE+. These variants share identical electrical characteristics but differ in package type (Narrow SO, TSSOP) or extended temperature ranges (-40°C to +85°C).

FAQ

How does the hot-swap feature function?

The hot-swap inputs hold the enable pins in a disabled state during power-up or board insertion, preventing erroneous data transfer caused by transient signal levels on the bus.

What is the purpose of slew-rate limiting?

Slew-rate limiting reduces electromagnetic interference (EMI) and minimizes signal reflections caused by improperly terminated cables, ensuring error-free transmission at lower data rates.

Which receivers provide optimum performance with this transmitter?

Optimum performance is achieved when used with the MAX3093E or MAX3095 5V quad differential line receivers, or the MAX3094E/MAX3096 3V quad differential line receivers.